A definition for ultrapotassic rocks is introduced using the chemical screens K 2 O> 3 wt.%,
MgO> 3 wt.% and K 2 O/Na 2 O> 2 for whole-rock analyses. On this basis a data base of …

The major element compositions of the various rocks that belong to the basalt clan are
examined, and the basalt clan is defined as consisting of those volcanic rocks that contain …

CRC Practical Handbooks are a series of single-volume bench manuals that feature a
synthesis of the most frequently used, basic reference information. These highly abridged …

This geochemical classification of granitic rocks is based upon three variables. These are
FeO/(FeO+ MgO)= Fe-number [or FeO tot/(FeO tot+ MgO)= Fe*], the modified alkali–lime …

In this paper we classify the range of feldspathic igneous rocks using five geochemical
variables: the FeO/(FeO+ MgO) ratio or Fe-index, the modified alkali–lime index, the …

An assessment of F-C1-OH partitioning between natural apatite and biotite in a variety of
rocks was used to evaluate reciprocal (Mg, Fe 2+, Al VI)(F, Cl, OH) mixing properties for …

The form of several sheet intrusions in a sandstone-shale host rock is regular, but much
more complex than the term “sheet intrusion” implies. The periphery of a sill emanating from …

A balanced text that bridges the gap between introductory petrography-oriented texts and
the more advanced texts that have a thermodynamic and/or chemical approach. Well …

Abstract Secondary Ca-Al silicates, including andradite-grossular garnet, epidote,
pumpellyite, and prehnite are shown to be extremely widespread as low-grade alteration …

Kimberlites, carbonatites and ultramafic, mafic and potassic lamprophyres have been
produced in West Greenland in recurrent events since the Archaean. Five distinct age …